Dental engine



(N0 New W. A. KNOWLES.

DENTAL ENGINE. 510.885.150. Patented D50. 25, 1888.

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lllrrn' TaTns PATENT IVILLIAM A. .KNOVL 1S, OF ALAMEDA, CALIFORNIA.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No. 395,150, dated. December 25, 18,88.

Application filed July 20, 1887.

To all whom, t may concern.-

Be it known that l, WILLIAM A. KNoWLEs, a citizen of the United States, residing in the city and count-y of Alameda, and State ot' California, have invented a new and useful Dental Engine, of which. the following is a speciiication.

My invention relates to improvements in dental engines, which will be understood by reference to the accompanying drawings and the letters referring thereto.

Figure l is a sectional view showing the machine eut vertically and longitudinally through the supporting-crane arm Q, a broken part of which is shown.. Fig. 2 is a front elevation, with the lower part of the crane-arm Q broken ott. Fig. 3 is a sectional view of the take-up pulleys, looking in at the rear of the lever-arm Q. Fig. a is a side elevation showing the crane. Fig. 5 is a longitudinal sectional view of the end ot the crane, with the take-up training-pulleys. Fig. G is a broken perspective view showing the tightening-pulleys Y and Y. Fi 7 is a plan view of the shifting-lever K K'.

A represents the head-block or outer shell of the machine; B, the door; C, the doorhinge 3 I), the catch-notch or lockhook upon the door; E, the catch-spring for locking the door; F, the cable-sleeve; F', the cablesrod; G, the friction-cable pinion; II and I, the miter friction-wheels; J', the clutch-collar; K and K', the shiftinglever spring-arms; L, the slot to allow the required movementof the shiftinglever; M, the catch notches or grooves in the slot L to serve as catches for the lever-arms K and K' when moved in shifting the gear, as will be explained; N, the driving-spindle; O, the driving-pulley; P, the driving-cord; Q, the. hollow supporting-crane lever; R, the main j ournal S, the fixed, part of the bearing for the main journal; T, the movable part of the bearing for the main journal; U, the top conebearing for the spindle 3 V, the lock piece; IV, the cable-sleeve; X, the adjustable frame for the takeaip pulleys; Y and Y', the takeup pulleys; Z, the set'screw for the takeup pulley-frame to take up the slack and regulate the tension ot' thedriving-cord P.

The following is the construction of my improved dental engine: I form the outer shell, A, of brass or other suitable metal, and nickel- Serial No. 244,333. (No model.)

plate or inish it as machinery of that class is usually finished. I form the main journal R large enough to make a steady connection with the crane-arm Q, while it allows the cable-sleeve NV to be revolved in any direction horizontally. I form the door .B in two parts, bolted together by the flanges C', to serve as a journal-bearing for the cable-rod F'. I hinge the same at C to allow the rod to be tipped down and the cable to hang vertically. I place the catch-notch D at the upper edge to be interlocked by the lock-spring E, which is beveled at the end so as to catch automatically when the drill or cable rod is brought up to a horizontal position and the door B closed. I form the large journal R with a suiiieient central opening to allow the spindle N to pass freely through. I form the top cone-bearing, U, to adjust, by means of the thread which is cut upon the same, and employ the catch-piece V to hold it from turning back when brought to the proper bearing upon the spindle N. I connect the miterwheels I-I and I by the sleeve J, which is allowed to slide up and down upon the spindle, but it is revolved with the spindle by means of a feather and groove-a well-known device, not necessary to show. I connect the shiftinglever with the sleeve J by means of the collar J'. I form the shifting-lever with the springarms K and` K', to catch by means of the catches C' in the notches M. I form the slot- L of su tlicient length to allow the miter-wheels Il and I to be shifted in and out of gear when required. I form the bearing for the journal R with the fixed part S and the movable part T for the purpose of attaching to the crane arm or lever Q. and allowing' the pulley O to be put inside of the arm, as shown in Fig. l. I form the crane-arm Q hollow or tubular to conceal the driving-cord l?. I form a slot, X', in the under part of the crane-arm Q, through which I pass the guide Z', and tighten the same by means of the set-screw Z, thus setting the ti ghteni n g-pulleys Y and Y' when adjusted to give the proper tension to the dri ving-cord I.

The following is the operation of my improved dental engine: In Fig. l. the pinion Gr is shown in gear with the wheel II, the lever K and K' havingbeen raised in the lever-slot L to an upper notch, M. To :reverse the 1no IOO v tion of the pinion G, the two spring-arms K K. of the shifting-lever are pressed together by the thumb and finger and Withdrawn from the upper notch, M, and lowered into the lower notch, M', thus lcarrying' the sleeve J up and bringing' the wheel I in gear with the pinion G and reversing' the motion of the same. To tip the cable-rod down, the catolispring E is raised and the cable swung down from the horizontal to a Vertical position.

Having thus described my invent-ion, what I claim, and desire to secure by Letters Patent, is-

l. In dental engines, the combination, with the head block or shell, slotted, as described,

and provided with notches therein, of the drive-spindle, the sleeve thereon carrying a fixed gear, and the spring-arm shifting-lever 'collared to the said sleeve, substantiallyas specified.

2. The combination, with the crane-arm having its under longitudinal side slotted, of a slide-bearing arranged therein, take-up pulleys journaled on the said slide-bearing, and an adj usting-screw for securing the bearing to the said crane-arm, substantially as specified.

XVILLIAM A. KNONVLES.

XVitnesses:

E. H. THARP, JOHN I-I. REDsToNE. 

